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			<h1>common_schema</h1> <strong>2.2</strong> documentation
			<div class="subtitle">DBA's framework for MySQL</div>
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				<h2><a href="sql_alter_table_tokudb.html">sql_alter_table_tokudb</a></h2>	
<h3>NAME</h3>
sql_alter_table_tokudb: Generate ALTER TABLE SQL statements for converting tables to TokuDB
<h3>TYPE</h3>
View

<h3>DESCRIPTION</h3>
<p></p>

<p><i>sql_alter_table_tokudb</i> provides with SQL statements to alter a table to TokuDB in two compression formats, and overcoming issue of KEY_BLOCK_SIZE
</p>

<p>
	There is a known issue with converting <strong>COMPRESSED</strong> InnoDB tables to TokuDB (<= 7.0.4 at this time).
	<br/>When the <strong>KEY_BLOCK_SIZE</strong> create option is specified, TokuDB wrongly applies it
	to all indexes, which makes for file size bloating instead of compression. 
</p>
<p>
	The only solution known to the author of this tool is to <strong>DROP</strong> all keys, reset the 
	<strong>KEY_BLOCK_SIZE</strong> to <strong>0</strong> and add all keys again. 
	Fortunately, this can be done in one (long) <strong>ALTER</strong> statement.
</p>
<p>
	This view provides such statements.
</p>

<h3>STRUCTURE</h3>

<blockquote><pre>
mysql&gt; DESC sql_alter_table_tokudb;
+--------------------+-------------+------+-----+---------+-------+
| Field              | Type        | Null | Key | Default | Extra |
+--------------------+-------------+------+-----+---------+-------+
| TABLE_SCHEMA       | varchar(64) | NO   |     |         |       |
| TABLE_NAME         | varchar(64) | NO   |     |         |       |
| ENGINE             | varchar(64) | YES  |     | NULL    |       |
| alter_fast_clause  | mediumtext  | YES  |     | NULL    |       |
| sql_alter_fast     | mediumtext  | YES  |     | NULL    |       |
| alter_small_clause | mediumtext  | YES  |     | NULL    |       |
| sql_alter_small    | mediumtext  | YES  |     | NULL    |       |
+--------------------+-------------+------+-----+---------+-------+
</pre></blockquote>

<h3>SYNOPSIS</h3>

<p>Columns of this view:
	<ul>
		<li><strong>TABLE_SCHEMA</strong>: schema of current table</li>
		<li><strong>TABLE_NAME</strong>: current table name</li>
		<li><strong>ENGINE</strong>: current engine name</li>
		<li><strong>alter_fast_clause</strong>: 
			The clause for <strong>ALTER TABLE</strong> to convert current table to TokuDB in <strong>TOKUDB_FAST</strong>
			(lightweight compression) row format.
		</li>
		<li><strong>sql_alter_fast</strong>: 
			A complete <strong>ALTER TABLE</strong> statement to convert current table to TokuDB in <strong>TOKUDB_FAST</strong>
			(lightweight compression) row format.
		</li>
		<li><strong>alter_small_clause</strong>: 
			The clause for <strong>ALTER TABLE</strong> to convert current table to TokuDB in <strong>TOKUDB_SMALL</strong>
			(aggressive compression) row format.
		</li>
		<li><strong>sql_alter_small</strong>: 
			A complete <strong>ALTER TABLE</strong> statement to convert current table to TokuDB in <strong>TOKUDB_SMALL</strong>
			(aggressive compression) row format.
		</li>
		
	</ul>
</p>

<p>The SQL statements are not terminated by ';'.</p>

<h3>EXAMPLES</h3>
<p>Generate ALTER TABLE statements for a test table:</p>
<blockquote><pre>mysql&gt; create table test.t (
  id int,
  c char,
  dt datetime,
  d double,
  PRIMARY KEY (id),
  KEY (dt, c)
);

mysql&gt; select * from common_schema.sql_alter_table_tokudb where table_schema='test' and table_name='t' \G

      TABLE_SCHEMA: test
        TABLE_NAME: t
            ENGINE: InnoDB
 alter_fast_clause: DROP KEY `dt`, DROP PRIMARY KEY, ADD KEY `dt`(`dt`,`c`), ADD PRIMARY KEY (`id`), engine=tokudb row_format=tokudb_small key_block_size=0;
    sql_alter_fast: alter table `test`.`t` DROP KEY `dt`, DROP PRIMARY KEY, ADD KEY `dt`(`dt`,`c`), ADD PRIMARY KEY (`id`), engine=tokudb row_format=tokudb_small key_block_size=0;
alter_small_clause: DROP KEY `dt`, DROP PRIMARY KEY, ADD KEY `dt`(`dt`,`c`), ADD PRIMARY KEY (`id`), engine=tokudb row_format=tokudb_small key_block_size=0;
   sql_alter_small: alter table `test`.`t` DROP KEY `dt`, DROP PRIMARY KEY, ADD KEY `dt`(`dt`,`c`), ADD PRIMARY KEY (`id`), engine=tokudb row_format=tokudb_small key_block_size=0;
</pre></blockquote>


<h3>ENVIRONMENT</h3>
TokuDB enabled server (>= 5.5)

<h3>SEE ALSO</h3>
<a href="sql_alter_table.html">sql_alter_table</a>,
<a href="tokudb_file_map.html">tokudb_file_map</a>

<h3>AUTHOR</h3>
Shlomi Noach
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